superhard

adjective
su·​per·​hard | \ ˌsü-pər-ˈhärd How to pronounce superhard (audio) \

Definition of superhard

: extremely hard One way to achieve such a high pressure … is to squeeze a sample between two superhard surfaces.— William J. Nellis

First Known Use of superhard

1891, in the meaning defined above

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The first known use of superhard was in 1891

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